The Sources window displays the simulation sources in a hierarchical tree, with views that show Hierarchy, IP Sources, Libraries, and Compile Order, as shown in the following figure.
Figure 1. Sources Window
The Sources buttons are described by tool tips when you hover the mouse over them. The buttons let you examine, expand, collapse, add to, open, filter and scroll through files.
You can also open or add a source file by right-clicking on the source object and selecting the Open File or Add Sources options.